/Engine/Source/Editor/ViewportInteraction/Public/ViewportDragOperation.h
Sets the drag operation class that will be used next time starting dragging
void SetDragOperationClass ( const [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UViewportDragOperation](API\Editor\ViewportInteraction\UViewportDragOperation) > InDragOperation )